The calculated distance (air line) between Saint-Lô and Marne La Vallée is approximately 170 miles respectively 274 kilometers.
By car or train, the actual journey to Marne La Vallée is certainly longer, as only the direct route (as the crow flies) between Saint-Lô and Marne La Vallée has been calculated here.
Air line (approximately)
274 kilometers
148 nautical miles